public void MassRankChange( Player player, Rank from, Rank to, string reason ) {
if( player == null ) throw new ArgumentNullException( "player" );
if( from == null ) throw new ArgumentNullException( "from" );
if( to == null ) throw new ArgumentNullException( "to" );
if( reason == null ) throw new ArgumentNullException( "reason" );
throw new NotImplementedException();
}